Question

4^20 +4^20 = 2^x find x​

Answer 1

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${4}^{20} + {4}^{20} = {2}^{x}$

now

${2}^{20 \times 2} + {2}^{20 \times 2} = {2}^{x}$

if the base is same then the power can be added or substrated .

${2}^{40} + {2}^{40} = {2}^{x}$

${2}^{2 \times 40} = {2}^{x} \\ x = 80$

hope it help ❣

Answer 2

The answer is 41. I checked it through my text bk too (ICSE MATHEMATICS CLASS 9- Frank) Hope it helps :-)